CN111146511A - BMS battery SOC correction maintenance method and system - Google Patents
BMS battery SOC correction maintenance method and system Download PDFInfo
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- CN111146511A CN111146511A CN201911217671.2A CN201911217671A CN111146511A CN 111146511 A CN111146511 A CN 111146511A CN 201911217671 A CN201911217671 A CN 201911217671A CN 111146511 A CN111146511 A CN 111146511A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a BMS battery SOC correction method and a system, wherein the method comprises the following steps: the second-level server authorizes the client with the maximum SOC deviation or applies SOC correction to the first-level server, the first-level server judges whether the client is authorized or not, the final result is sent to the second-level server, and meanwhile the first-level server changes the signal indication state; when the second-level server judges that the SOC value of the client or the second-level server is higher or lower according to the SOC set value, starting a discharging or charging limiting condition until the battery voltage is full or discharged to the set value, and removing the discharging or charging limiting condition; the second-level server clears the SOC correction maintenance state, and the first-level server starts to authorize the next client or the second-level server applying for SOC correction. By adopting the method and the system, the battery maintenance efficiency and accuracy can be improved, the maintenance cost can be saved, and the application value of the energy storage system can be improved.
Description
Technical Field
The invention relates to the field of battery maintenance, in particular to a BMS battery SOC correction maintenance method and system.
Background
Along with the continuous improvement of battery energy storage system, energy storage system has been by the single independent battery stack system in early stage, and gradual development is large-scale distributed box type cluster system, along with battery energy storage system's continuous operation, after certain charge-discharge cycle number, the battery of every battery stack can appear the differentiation of different degrees, for example SOC inconsistent problem, how let battery management system carry out automatic efficient maintenance, be the problem of treating to solve urgently.
At present, the generally adopted maintenance method is to stop the operation of the whole distributed box type energy storage system, perform battery maintenance operation once, seriously affect the client income and weaken the function of energy storage to maintain the stability of a power grid, and the like, on one hand, for a large distributed box type energy storage system, a plurality of battery box systems are provided, when a plurality of battery stacks have a plurality of maintenance mode requirements, not only the manual maintenance cost is sharply increased, but also the efficiency is lower, the error probability is higher, on the other hand, because EMS is not a battery management system BMS, the battery characteristics and the battery differences of each battery stack are difficult to control, so the battery maintenance of accurate positioning can not be realized by combining the characteristics of each battery stack; overall, the original battery maintenance method greatly reduces the application value of the distributed box-type energy storage system and influences the comprehensive benefits of the distributed box-type energy storage system.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a BMS battery SOC correction maintenance method which can improve the battery maintenance efficiency and accuracy and improve the application value of an energy storage system.
The invention also provides a system for correcting the SOC of the BMS battery.
In a first aspect, an embodiment of the present invention provides a BMS battery SOC correction maintenance method:
the method comprises the following steps:
s100: the second-level server authorizes the client with the maximum SOC deviation or applies SOC correction to the first-level server by the second-level server, the first-level server judges whether authorization is available or not, and a final result is sent to the second-level server;
s200: the second-level server judges whether the SOC value of the client side with the maximum deviation or the second-level server is higher than a set value according to an SOC set value, and starts a discharging limiting condition until the battery voltage is fully charged to the set value, and releases the discharging limiting condition;
s300: the second-level server starts the charging limiting condition when judging that the SOC value of the client or the second-level server is lower than the set value according to the SOC set value until the battery discharges to the set value, and releases the charging limiting condition;
s400: after step S200 or S300 is executed, the second-level server clears the SOC correction maintenance state, and the first-level server starts authorizing the next client or the second-level server that is applying for SOC correction.
The BMS battery SOC correction maintenance method provided by the embodiment of the invention at least has the following beneficial effects: the battery maintenance efficiency and accuracy are improved, and the application value of the energy storage system is improved.
According to another embodiment of the present invention, the S100 specifically includes:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
s120: the second-level server counts and sorts the calculated SOC deviations;
s130: the second-level server authorizes the client with the maximum SOC deviation or the second-level server to apply SOC correction to the first-level server;
s140: after receiving the SOC correction application, the first-level server judges whether the SOC correction application meets the condition of authorizing the client or the second-level server to enter SOC maintenance;
s150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
s160: the second-level server judges whether an authorization instruction is received or not;
s170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-level server receives the maintenance state flag signal, correspondingly changing the signal indication state.
According to another embodiment of the present invention, the S200 specifically includes:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharging limiting condition;
s220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
s230: and detecting that the single battery is fully charged to a set voltage, and removing the discharge limiting condition.
According to another embodiment of the present invention, S300 specifically includes:
s310: when the second-level server judges that the SOC value of the client or the second-level server is lower than a set value, starting a charging limiting condition;
s320: the second-level server reduces the dischargeable power according to the minimum voltage condition of the single battery;
s330: and detecting that the single battery is discharged to a set voltage, and removing the charging limitation condition.
According to another embodiment of the present invention, the S400 specifically includes:
s410: the second-level server clears the SOC correction maintenance state;
s420: the first-stage server correspondingly changes the signal indication state after detecting the SOC correction maintenance state change of the second-stage server;
s430: the first-level server starts to authorize the client or the second-level server which is applying for SOC correction next time;
s440: the steps after S120 are continuously performed.
In a second aspect, an embodiment of the present invention provides a BMS battery SOC correction system including: the system comprises a first-level server, a second-level server and clients, wherein the first-level server is an EMS or a BMS, the second-level server is a BMS, the clients are BMSs, the first-level server is connected with the second-level servers, and the second-level servers are connected with the clients.
The BMS battery SOC correction maintenance system provided by the embodiment of the invention at least has the following beneficial effects: the system scene of application can be provided for the battery SOC correction maintenance method, the labor input is saved, and the maintainability of the battery is improved.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a BMS battery SOC correction maintenance method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an embodiment of step S100 of FIG. 1;
FIG. 3 is a flowchart illustrating an embodiment of step S200 of FIG. 1;
FIG. 4 is a flowchart illustrating an embodiment of step S300 of FIG. 1;
fig. 5 is a flowchart illustrating an embodiment of step S400 in fig. 1.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.
It should be noted that, in practical application, different kinds of maintenance modes may exist, for example, battery capacity calibration maintenance, battery balance consistency maintenance, battery internal resistance calculation maintenance, battery small current depolarization maintenance, battery SOC correction maintenance, and the like, in this embodiment, a maintenance requirement level is designed for a case where a single maintenance mode is applied or a plurality of maintenance modes are performed simultaneously, and the maintenance requirement level is described in the following exemplary form, for example: the method comprises the following steps of calibrating and maintaining the battery capacity, maintaining a demand grade H1, correcting and maintaining the battery SOC, maintaining a demand grade H2, maintaining the depolarization of the battery under low current, maintaining a demand grade H3, maintaining the balance consistency of the battery, maintaining a demand grade H4, calculating the demand of the battery internal resistance, and maintaining a demand grade H5, wherein when the value of the maintenance demand grade is 0, the maintenance demand priority POM of each battery stack BMS, namely the priority of the battery stack BMS, is short for calculation: the POM is H1+ H2+ H3+ H4+ H5, where the values of H1 to H5 may be configured according to a program, the second-level server compares the POM values of the client or the second-level server, the higher the POM value is, the higher the priority is, further, for example, the POM value with the highest priority is H2+ H3 is 5, where H2 is 4, and H1 is 1, which proves that the client or the second-level server preferentially performs SOC correction with the maintenance level of H2.
Example 1: referring to fig. 1, a flowchart illustrating a BMS battery SOC correction method according to an embodiment of the present invention is shown. The method specifically comprises the following steps:
s100: the second-level server authorizes the client with the maximum SOC deviation or applies SOC correction to the first-level server by the second-level server, the first-level server judges whether authorization is available or not, and a final result is sent to the second-level server;
specifically, the second-level server may determine that the object with the largest SOC deviation may be the BMS configured as the client, and after determining that the object with the largest SOC deviation is determined, the first-level server authorizes the object with the largest voltage difference, and then the first-level server sends the authorization result to the second-level server, and the signal indication state at the first-level server side changes.
S200: the second-level server judges whether the SOC value of the client side with the maximum deviation or the second-level server is higher than a set value according to an SOC set value, and starts a discharging limiting condition until the battery voltage is fully charged to the set value, and releases the discharging limiting condition;
specifically, this step is a more specific implementation of the above step S100, where the second-level server compares the SOC value of the client or the second-level server itself with a reference value according to the SOC value set by the system, and this step is to start the discharge limiting condition, that is, the second-level server cannot discharge at this time, only allow charging, until the battery voltage is fully charged to the system set value, and release the discharge limiting condition, that is, allow discharging at this time.
S300: the second-level server starts the charging limiting condition when judging that the SOC value of the client or the second-level server is lower than the set value according to the SOC set value until the battery discharges to the set value, and releases the charging limiting condition;
specifically, this step is a more specific implementation of the above step S100, where the second-level server compares the SOC value of the client or the second-level server itself with a reference value according to the SOC value set by the system, and this step is directed to a case of being low, at this time, the second-level server starts the charge limiting condition, that is, at this time, the charging is not possible, only the discharging is allowed, until the battery voltage is discharged to the system set value, and releases the charge limiting condition, that is, at this time, the charging is allowed.
S400: after step S200 or S300 is executed, the second-level server clears the SOC correction maintenance state, and the first-level server starts authorizing the next client or the second-level server that is applying for SOC correction.
Specifically, after the step S200 or S300 is executed, it is proved that a charging or discharging process of the battery is completed, at this time, the second-level server clears the SOC correction maintenance state, that is, the SOC correction maintenance is not required under the existing condition, and at this time, the first-level server starts to authorize the next client or the second-level server applying for SOC correction.
Embodiment 2, referring to fig. 2, shows a step S100 in fig. 1 in the embodiment of the present invention, which specifically includes the steps of:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
specifically, the second-level server is configured as a BMS of the server in advance by the system, the rest BMSs are configured as clients, the BMS serving as the second-level server has the function of independently executing maintenance operation as the same as the functions of the BMSs serving as the clients, but the BMS serving as the second-level server has the functions of integrally planning, calculating and selecting one or more BMSs serving as the clients to apply maintenance instructions to the first-level server, so that the second-level server can monitor the clients and detect the second-level server when the second-level server performs SOC real-time detection.
S120: the second-level server counts and sorts the calculated SOC deviations;
specifically, the statistical ranking of the SOC deviation in this step includes performing comprehensive ranking on the SOC deviations of the monitoring client and the second-level server.
S130: the second-level server authorizes the client with the maximum SOC deviation or the second-level server to apply SOC correction to the first-level server;
specifically, as the BMS having the overall function, the second-level server may have authority to apply for the SOC correction from the first-level server to the client with the largest deviation for authorization, and as can be understood from the above steps, the BMS with the largest deviation may be the client or may be the second-level server itself.
S140: after receiving the SOC correction application, the first-level server judges whether the SOC correction application meets the condition of authorizing the client or the second-level server to enter SOC maintenance;
specifically, after the first-stage server receives the application of the SOC correction, the first-stage server judges whether the client applying the SOC correction or the second-stage server meets the preset conditions according to the preset conditions, if so, the next maintenance mode is entered, and if not, the first-stage server continues to circularly judge whether the preset conditions are met.
S150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
specifically, in combination with step S14, when the first-level server determines that the client or the second-level server that meets the authorized SOC maintenance condition enters the maintenance mode.
S160: the second-level server judges whether an authorization instruction is received or not;
specifically, if the second-level server determines that the authorization command is received, the next step is performed, and if the authorization command is not received, the steps S150 and S160 are executed in a loop.
S170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-level server receives the maintenance state flag signal, correspondingly changing the signal indication state.
Specifically, after the first-stage server receives the maintenance state signal, the corresponding stack icon is switched from a normally-operating green mark to a yellow mark, or the graphic description of SOC correction is displayed on the first-stage server so as to inform a user that the corresponding stack enters the SOC correction maintenance state, or the color mark and the graphic description are simultaneously applied, so that the system can be more intuitive and easier to understand.
Example 3: as shown in fig. 3, the step S200 in fig. 1 in the embodiment of the present invention specifically includes the steps of:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharging limiting condition;
specifically, the discharge limiting condition here is to set the dischargeable power to zero.
S220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
specifically, the secondary server reduces the chargeable power in steps according to the maximum voltage of the single battery, for example: if the battery is set to a full voltage of 3.6V, the example of the step reduction is as follows:
(1) when the maximum voltage of the single body is less than 3.5V, the maximum chargeable power is full power;
(2) when the maximum voltage of the single body is between 3.5V and 3.55V, the maximum chargeable power is 0.5C multiplying power;
(3) when the maximum voltage of the single body is between 3.55V and 3.6V, the maximum chargeable power is 0.2C multiplying power;
(4) until the battery is fully charged to 3.6V.
From the above, it can be seen that in this step, the chargeable power is reduced in steps according to the maximum voltage of the single battery until the battery is fully charged.
S230: and detecting that the single battery is fully charged to a set voltage, and removing the discharge limiting condition.
Example 4: as shown in fig. 4, the step S300 in fig. 1 in the embodiment of the present invention specifically includes the steps of:
s310: when the second-level server judges that the SOC value of the client or the second-level server is lower than a set value, starting a charging limiting condition;
specifically, the charging limitation condition in this step is zero clearing of the chargeable power.
S320: the second-level server reduces the dischargeable power according to the minimum voltage condition of the single battery;
specifically, the second-stage server reduces the dischargeable power in a gradient manner according to the minimum voltage condition of the single body, and if the battery is set to have a discharge voltage of 2.7V, the gradient reduction example is as follows:
(1) when the minimum voltage of the single battery is more than 2.9V, the maximum dischargeable power is full power;
(2) when the minimum voltage of the single battery is between 2.8V and 2.9V, the maximum dischargeable power is 0.5C multiplying power;
(3) when the minimum voltage of the single battery is between 2.7V and 2.8V, the maximum dischargeable power is 0.2C multiplying power;
(4) until the battery was emptied to 2.7V.
S330: and detecting that the single battery is discharged to a set voltage, and removing the charging limitation condition.
Example 5: fig. 5 shows a step S400 in fig. 1 in the embodiment of the present invention, which specifically includes the steps of:
s410: the second-level server clears the SOC correction maintenance state;
it is understood that the SOC correction maintenance state is cleared, that is, the client or the second-level server does not need to perform SOC maintenance at this time.
S420: the first-stage server correspondingly changes the signal indication state after detecting the SOC correction maintenance state change of the second-stage server;
specifically, after the first-level server detects the change of the SOC correction maintenance state of the second-level server, the corresponding icon is switched from a yellow maintenance mode to a green normal operation mode.
S430: the first-level server starts to authorize the client or the second-level server which is applying for SOC correction next time;
s440: the steps after S120 are continuously performed.
Embodiment 6, BMS battery SOC correction system, comprising: the system comprises a first-level server, a second-level server and clients, wherein the first-level server is an EMS or a BMS, the second-level server is a BMS, the clients are BMSs, the first-level server is connected with the second-level servers, and the second-level servers are connected with the clients.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (6)
1. A BMS battery SOC correction maintenance method is characterized by comprising the following steps:
s100: the second-level server authorizes the client with the maximum SOC deviation or applies SOC correction to the first-level server by the second-level server, the first-level server judges whether authorization is available or not, and a final result is sent to the second-level server;
s200: the second-level server judges whether the SOC value of the client side with the maximum deviation or the second-level server is higher than a set value according to an SOC set value, and starts a discharging limiting condition until the battery voltage is fully charged to the set value, and releases the discharging limiting condition;
s300: the second-level server starts the charging limiting condition when judging that the SOC value of the client or the second-level server is lower than the set value according to the SOC set value until the battery discharges to the set value, and releases the charging limiting condition;
s400: after step S200 or S300 is executed, the second-level server clears the SOC correction maintenance state, and the first-level server starts authorizing the next client or the second-level server that is applying for SOC correction.
2. The BMS battery SOC correction maintenance method according to claim 1, wherein the S100 specifically comprises:
s110: the second-level server monitors the SOC of the client or the second-level server in real time and calculates the SOC deviation in real time;
s120: the second-level server counts and sorts the calculated SOC deviations;
s130: the second-level server authorizes the client with the maximum SOC deviation or the second-level server to apply SOC correction to the first-level server;
s140: after receiving the SOC correction application, the first-level server judges whether the SOC correction application meets the condition of authorizing the client or the second-level server to enter SOC maintenance;
s150: the first-level server authorizes the corresponding client or the second-level server to enter a maintenance mode;
s160: the second-level server judges whether an authorization instruction is received or not;
s170: the second-level server generates a maintenance state flag signal for the client or the second-level server to enter SOC correction and sends the maintenance state flag signal to the first-level server;
s180: and after the first-level server receives the maintenance state flag signal, correspondingly changing the signal indication state.
3. The BMS battery SOC correction maintenance method according to claim 1, wherein the S200 specifically includes:
s210: when the second-level server judges that the SOC value of the client or the second-level server is higher than a set value, starting a discharging limiting condition;
s220: the second-stage server reduces the chargeable power according to the maximum voltage condition of the single battery;
s230: and detecting that the single battery is fully charged to a set voltage, and removing the discharge limiting condition.
4. The BMS battery SOC correction maintenance method according to claim 3, wherein the S300 specifically comprises:
s310: when the second-level server judges that the SOC value of the client or the second-level server is lower than a set value, starting a charging limiting condition;
s320: the second-level server reduces the dischargeable power according to the minimum voltage condition of the single battery;
s330: and detecting that the single battery is discharged to a set voltage, and removing the charging limitation condition.
5. The BMS battery SOC correction maintenance method according to claim 3, wherein the S400 specifically comprises:
s410: the second-level server clears the SOC correction maintenance state;
s420: the first-stage server correspondingly changes the signal indication state after detecting the SOC correction maintenance state change of the second-stage server;
s430: the first-level server starts to authorize the client or the second-level server which is applying for SOC correction next time;
s440: the steps after S120 are continuously performed.
6. A BMS battery SOC correction system to which the method of any one of claims 1 to 5 is applied, comprising: the system comprises a first-level server, a second-level server and a client, wherein the first-level server is an EMS or a BMS, the second-level server is a BMS, the client is the BMS, the first-level server is connected with one or more second-level servers, and the second-level servers are connected with one or more clients.
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| CN114114026A (en) * | 2021-10-19 | 2022-03-01 | 天津力神电池股份有限公司 | Method for analyzing cell internal resistance constituent elements and change characteristics thereof |
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| CN109375110A (en) * | 2018-09-11 | 2019-02-22 | 深圳市科陆电子科技股份有限公司 | Energy-storage system SOC self-correcting system |
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| US20110184677A1 (en) * | 2010-01-26 | 2011-07-28 | Yongjun Tae | Battery management system and driving method thereof |
| CN103344919A (en) * | 2013-06-26 | 2013-10-09 | 天津市松正电动汽车技术股份有限公司 | Method for calibrating SOC of lithium-ion battery |
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| CN114114026A (en) * | 2021-10-19 | 2022-03-01 | 天津力神电池股份有限公司 | Method for analyzing cell internal resistance constituent elements and change characteristics thereof |
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